mirror of https://github.com/GNOME/gimp.git
327 lines
9.0 KiB
C
327 lines
9.0 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <gtk/gtk.h>
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#include "apptypes.h"
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#include "appenv.h"
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#include "drawable.h"
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#include "gdisplay.h"
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#include "gimage_mask.h"
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#include "gimpimage.h"
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#include "gimpprogress.h"
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#include "gimpui.h"
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#include "info_dialog.h"
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#include "selection.h"
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#include "tile_manager.h"
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#include "undo.h"
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#include "perspective_tool.h"
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#include "tools.h"
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#include "transform_core.h"
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#include "transform_tool.h"
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#include "libgimp/gimpintl.h"
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/* forward function declarations */
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static TileManager * perspective_tool_transform (Tool *tool,
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GDisplay *gdisp,
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TransformState state);
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static void perspective_tool_recalc (Tool *tool,
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GDisplay *gdisp);
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static void perspective_tool_motion (Tool *tool,
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GDisplay *gdisp);
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static void perspective_info_update (Tool *tool);
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/* storage for information dialog fields */
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static gchar matrix_row_buf [3][MAX_INFO_BUF];
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static TileManager *
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perspective_tool_transform (Tool *tool,
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GDisplay *gdisp,
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TransformState state)
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{
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TransformCore *transform_core;
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transform_core = (TransformCore *) tool->private;
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switch (state)
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{
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case TRANSFORM_INIT:
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if (!transform_info)
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{
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transform_info =
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info_dialog_new (_("Perspective Transform Information"),
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gimp_standard_help_func,
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"tools/transform_perspective.html");
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info_dialog_add_label (transform_info, _("Matrix:"),
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matrix_row_buf[0]);
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info_dialog_add_label (transform_info, "", matrix_row_buf[1]);
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info_dialog_add_label (transform_info, "", matrix_row_buf[2]);
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}
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gtk_widget_set_sensitive (GTK_WIDGET (transform_info->shell), TRUE);
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transform_core->trans_info [X0] = (double) transform_core->x1;
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transform_core->trans_info [Y0] = (double) transform_core->y1;
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transform_core->trans_info [X1] = (double) transform_core->x2;
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transform_core->trans_info [Y1] = (double) transform_core->y1;
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transform_core->trans_info [X2] = (double) transform_core->x1;
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transform_core->trans_info [Y2] = (double) transform_core->y2;
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transform_core->trans_info [X3] = (double) transform_core->x2;
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transform_core->trans_info [Y3] = (double) transform_core->y2;
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return NULL;
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break;
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case TRANSFORM_MOTION:
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perspective_tool_motion (tool, gdisp);
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perspective_tool_recalc (tool, gdisp);
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break;
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case TRANSFORM_RECALC:
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perspective_tool_recalc (tool, gdisp);
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break;
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case TRANSFORM_FINISH:
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/* Let the transform core handle the inverse mapping */
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gtk_widget_set_sensitive (GTK_WIDGET (transform_info->shell), FALSE);
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return
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perspective_tool_perspective (gdisp->gimage,
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gimp_image_active_drawable (gdisp->gimage),
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gdisp,
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transform_core->original,
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transform_tool_smoothing (),
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transform_core->transform);
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break;
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}
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return NULL;
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}
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Tool *
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tools_new_perspective_tool (void)
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{
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Tool *tool;
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TransformCore *private;
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tool = transform_core_new (PERSPECTIVE, TRUE);
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private = tool->private;
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/* set the rotation specific transformation attributes */
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private->trans_func = perspective_tool_transform;
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private->trans_info[X0] = 0;
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private->trans_info[Y0] = 0;
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private->trans_info[X1] = 0;
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private->trans_info[Y1] = 0;
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private->trans_info[X2] = 0;
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private->trans_info[Y2] = 0;
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private->trans_info[X3] = 0;
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private->trans_info[Y3] = 0;
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/* assemble the transformation matrix */
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gimp_matrix3_identity (private->transform);
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return tool;
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}
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void
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tools_free_perspective_tool (Tool *tool)
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{
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transform_core_free (tool);
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}
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static void
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perspective_info_update (Tool *tool)
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{
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TransformCore *transform_core;
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gint i;
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transform_core = (TransformCore *) tool->private;
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for (i = 0; i < 3; i++)
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{
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gchar *p = matrix_row_buf[i];
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gint j;
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for (j = 0; j < 3; j++)
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{
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p += g_snprintf (p, MAX_INFO_BUF - (p - matrix_row_buf[i]),
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"%10.3g", transform_core->transform[i][j]);
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}
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}
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info_dialog_update (transform_info);
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info_dialog_popup (transform_info);
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return;
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}
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static void
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perspective_tool_motion (Tool *tool,
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GDisplay *gdisp)
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{
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TransformCore *transform_core;
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gint diff_x, diff_y;
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transform_core = (TransformCore *) tool->private;
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diff_x = transform_core->curx - transform_core->lastx;
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diff_y = transform_core->cury - transform_core->lasty;
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switch (transform_core->function)
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{
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case TRANSFORM_HANDLE_1:
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transform_core->trans_info [X0] += diff_x;
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transform_core->trans_info [Y0] += diff_y;
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break;
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case TRANSFORM_HANDLE_2:
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transform_core->trans_info [X1] += diff_x;
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transform_core->trans_info [Y1] += diff_y;
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break;
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case TRANSFORM_HANDLE_3:
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transform_core->trans_info [X2] += diff_x;
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transform_core->trans_info [Y2] += diff_y;
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break;
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case TRANSFORM_HANDLE_4:
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transform_core->trans_info [X3] += diff_x;
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transform_core->trans_info [Y3] += diff_y;
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break;
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default:
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break;
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}
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}
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static void
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perspective_tool_recalc (Tool *tool,
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GDisplay *gdisp)
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{
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TransformCore *transform_core;
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GimpMatrix3 m;
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gdouble cx, cy;
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gdouble scalex, scaley;
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transform_core = (TransformCore *) tool->private;
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/* determine the perspective transform that maps from
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* the unit cube to the trans_info coordinates
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*/
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perspective_find_transform (transform_core->trans_info, m);
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cx = transform_core->x1;
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cy = transform_core->y1;
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scalex = 1.0;
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scaley = 1.0;
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if (transform_core->x2 - transform_core->x1)
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scalex = 1.0 / (transform_core->x2 - transform_core->x1);
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if (transform_core->y2 - transform_core->y1)
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scaley = 1.0 / (transform_core->y2 - transform_core->y1);
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/* assemble the transformation matrix */
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gimp_matrix3_identity (transform_core->transform);
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gimp_matrix3_translate (transform_core->transform, -cx, -cy);
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gimp_matrix3_scale (transform_core->transform, scalex, scaley);
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gimp_matrix3_mult (m, transform_core->transform);
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/* transform the bounding box */
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transform_core_transform_bounding_box (tool);
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/* update the information dialog */
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perspective_info_update (tool);
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}
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void
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perspective_find_transform (gdouble *coords,
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GimpMatrix3 matrix)
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{
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gdouble dx1, dx2, dx3, dy1, dy2, dy3;
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gdouble det1, det2;
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dx1 = coords[X1] - coords[X3];
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dx2 = coords[X2] - coords[X3];
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dx3 = coords[X0] - coords[X1] + coords[X3] - coords[X2];
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dy1 = coords[Y1] - coords[Y3];
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dy2 = coords[Y2] - coords[Y3];
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dy3 = coords[Y0] - coords[Y1] + coords[Y3] - coords[Y2];
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/* Is the mapping affine? */
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if ((dx3 == 0.0) && (dy3 == 0.0))
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{
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matrix[0][0] = coords[X1] - coords[X0];
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matrix[0][1] = coords[X3] - coords[X1];
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matrix[0][2] = coords[X0];
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matrix[1][0] = coords[Y1] - coords[Y0];
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matrix[1][1] = coords[Y3] - coords[Y1];
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matrix[1][2] = coords[Y0];
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matrix[2][0] = 0.0;
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matrix[2][1] = 0.0;
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}
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else
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{
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det1 = dx3 * dy2 - dy3 * dx2;
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det2 = dx1 * dy2 - dy1 * dx2;
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matrix[2][0] = det1 / det2;
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det1 = dx1 * dy3 - dy1 * dx3;
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det2 = dx1 * dy2 - dy1 * dx2;
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matrix[2][1] = det1 / det2;
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matrix[0][0] = coords[X1] - coords[X0] + matrix[2][0] * coords[X1];
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matrix[0][1] = coords[X2] - coords[X0] + matrix[2][1] * coords[X2];
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matrix[0][2] = coords[X0];
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matrix[1][0] = coords[Y1] - coords[Y0] + matrix[2][0] * coords[Y1];
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matrix[1][1] = coords[Y2] - coords[Y0] + matrix[2][1] * coords[Y2];
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matrix[1][2] = coords[Y0];
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}
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matrix[2][2] = 1.0;
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}
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TileManager *
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perspective_tool_perspective (GImage *gimage,
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GimpDrawable *drawable,
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GDisplay *gdisp,
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TileManager *float_tiles,
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gboolean interpolation,
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GimpMatrix3 matrix)
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{
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GimpProgress *progress;
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TileManager *ret;
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progress = progress_start (gdisp, _("Perspective..."), FALSE, NULL, NULL);
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ret = transform_core_do (gimage, drawable, float_tiles,
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interpolation, matrix,
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progress ? progress_update_and_flush :
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(GimpProgressFunc) NULL,
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progress);
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if (progress)
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progress_end (progress);
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return ret;
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}
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